Propriedades hidráulicas de um latossolo amarelo em diferentes profundidades

Abstract

The Alagoas region has scarce information on hydraulic properties such as soil water retention curve CR and hydraulic conductivity of saturated soil Ksat. Therefore, this work aimed to determine the water retention curve in the soil, and the saturated hydraulic conductivity of the soil Ksat, given the scarcity of these data in the Alagoas region. The undisturbed soil samples were collected in volumetric rings with a diameter of 5 cm and a height of 2.65 cm (volume of 52.03 cm3), using an auger for undisturbed samples (SONDATERRAR ). The samples were taken at depths of 0-10 and 10-20 cm with 4 repetitions for each depth to determine Ksat and 2 repetitions for the retention curve. The computer program RETC is capable of generating Van Genuchten equation parameters that satisfactorily fit the data obtained by the Haines funnel and Richards chamber. The Rosetta program using, for the 0-10 cm layer, of the study soil using granulometry and density data can present an estimate of the saturated hydraulic conductivity of the soil. However, it is not recommended for other depths. Therefore, in general, an analysis with pedotransfer functions arising from local soil adjustments is essential.